Fixed controls getting styled multiple times.

Perspex.UnitTests/Controls/ContentControlTests.cs

@@ -0,0 +1,80 @@
+// -----------------------------------------------------------------------
+// <copyright file="ContentControlTests.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.UnitTests.Controls
+{
+    using System.Linq;
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+    using Moq;
+    using Perspex.Controls;
+    using Perspex.Layout;
+    using Perspex.Styling;
+    using Perspex.Themes.Default;
+    using Splat;
+
+    [TestClass]
+    public class ContentControlTests
+    {
+        [TestMethod]
+        public void Template_Should_Be_Instantiated()
+        {
+            var target = new ContentControl();
+            target.Content = "Foo";
+            target.Template = this.GetTemplate();
+
+            var child = ((IVisual)target).VisualChildren.Single();
+            Assert.IsInstanceOfType(child, typeof(Border));
+            child = child.VisualChildren.Single();
+            Assert.IsInstanceOfType(child, typeof(ContentPresenter));
+            child = child.VisualChildren.Single();
+            Assert.IsInstanceOfType(child, typeof(TextBlock));
+        }
+
+        [TestMethod]
+        public void Templated_Children_Should_Be_Styled()
+        {
+            using (Locator.CurrentMutable.WithResolver())
+            {
+                var root = new TestRoot();
+                var target = new ContentControl();
+                var styler = new Mock<IStyler>();
+
+                Locator.CurrentMutable.Register(() => styler.Object, typeof(IStyler));
+                target.Content = "Foo";
+                target.Template = this.GetTemplate();
+                root.Content = target;
+
+                this.ApplyTemplate(target);
+
+                styler.Verify(x => x.ApplyStyles(It.IsAny<ContentControl>()), Times.Once());
+                styler.Verify(x => x.ApplyStyles(It.IsAny<Border>()), Times.Once());
+                styler.Verify(x => x.ApplyStyles(It.IsAny<ContentPresenter>()), Times.Once());
+                styler.Verify(x => x.ApplyStyles(It.IsAny<TextBlock>()), Times.Once());
+            }
+        }
+
+        private void ApplyTemplate(IVisual visual)
+        {
+            foreach (IVisual child in visual.VisualChildren)
+            {
+                this.ApplyTemplate(child);
+            }
+        }
+
+        private ControlTemplate GetTemplate()
+        {
+            return new ControlTemplate(parent =>
+            {
+                Border border = new Border();
+                border.Background = new Perspex.Media.SolidColorBrush(0xffffffff);
+                ContentPresenter contentPresenter = new ContentPresenter();
+                contentPresenter.SetValue(ContentPresenter.ContentProperty, parent.GetObservable(ContentControl.ContentProperty));
+                border.Content = contentPresenter;
+                return border;
+            });
+        }
+    }
+}

Perspex.UnitTests/Perspex.UnitTests.csproj

@@ -68,6 +68,7 @@
     </Otherwise>
   </Choose>
   <ItemGroup>
+    <Compile Include="Controls\ContentControlTests.cs" />
     <Compile Include="Controls\ControlTests.cs" />
     <Compile Include="Controls\TemplatedControlTests.cs" />
     <Compile Include="PerspexPropertyTests.cs" />
@@ -85,6 +86,7 @@
     <Compile Include="Styling\TestSelectors.cs" />
     <Compile Include="Styling\TestObservable.cs" />
     <Compile Include="Styling\TestControlBase.cs" />
+    <Compile Include="TestRoot.cs" />
     <Compile Include="TestSubject.cs" />
     <Compile Include="TestObserver.cs" />
   </ItemGroup>

Perspex.UnitTests/Styling/TestTemplatedControl.cs

@@ -6,6 +6,7 @@
 
 namespace Perspex.UnitTests.Styling
 {
+    using System;
     using System.Collections.Generic;
     using Perspex.Controls;
     using Perspex.Styling;
@@ -32,6 +33,11 @@ namespace Perspex.UnitTests.Styling
             get;
         }
 
+        public IObservable<T> GetObservable<T>(PerspexProperty<T> property)
+        {
+            throw new NotImplementedException();
+        }
+
         public abstract void SetValue(PerspexProperty property, object value, System.IObservable<bool> activator);
     }
 }

Perspex.UnitTests/TestRoot.cs

@@ -0,0 +1,27 @@
+// -----------------------------------------------------------------------
+// <copyright file="TestRoot.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.UnitTests
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Reactive.Disposables;
+    using Perspex.Controls;
+    using Perspex.Layout;
+
+    internal class TestRoot : Decorator, ILayoutRoot
+    {
+        public Size ClientSize
+        {
+            get { throw new NotImplementedException(); }
+        }
+
+        public ILayoutManager LayoutManager
+        {
+            get { throw new NotImplementedException(); }
+        }
+    }
+}

Perspex/Controls/ContentControl.cs

@@ -10,7 +10,7 @@ namespace Perspex.Controls
     using System.Collections.Generic;
     using System.Linq;
 
-    public abstract class ContentControl : TemplatedControl
+    public class ContentControl : TemplatedControl
     {
         public static readonly PerspexProperty<object> ContentProperty =
             PerspexProperty.Register<ContentControl, object>("Content");

Perspex/Controls/Control.cs

@@ -244,14 +244,7 @@ namespace Perspex.Controls
 
         public ILayoutRoot GetLayoutRoot()
         {
-            Control c = this;
-
-            while (c != null && !(c is ILayoutRoot))
-            {
-                c = c.Parent;
-            }
-
-            return (ILayoutRoot)c;
+            return this.GetVisualAncestorOrSelf<ILayoutRoot>();
         }
 
         public void Arrange(Rect rect)

Perspex/Controls/Decorator.cs

@@ -43,6 +43,11 @@ namespace Perspex.Controls
             set { this.SetValue(PaddingProperty, value); }
         }
 
+        IEnumerable<IVisual> IVisual.ExistingVisualChildren
+        {
+            get { return ((IVisual)this).VisualChildren; }
+        }
+
         IEnumerable<IVisual> IVisual.VisualChildren
         {
             get 

Perspex/Controls/ITemplatedControl.cs

@@ -6,10 +6,19 @@
 
 namespace Perspex.Controls
 {
+    using System;
     using System.Collections.Generic;
 
     public interface ITemplatedControl
     {
+        /// <summary>
+        /// Gets an observable for a <see cref="PerspexProperty"/>.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="property">The property to get the observable for.</param>
+        /// <returns>The observable.</returns>
+        IObservable<T> GetObservable<T>(PerspexProperty<T> property);
+
         IEnumerable<IVisual> VisualChildren { get; }
     }
 }

Perspex/Controls/TemplatedControl.cs

@@ -24,6 +24,11 @@ namespace Perspex.Controls
             set { this.SetValue(TemplateProperty, value); }
         }
 
+        IEnumerable<IVisual> IVisual.ExistingVisualChildren
+        {
+            get { return Enumerable.Repeat(this.visualChild, this.visualChild != null ? 1 : 0); }
+        }
+
         IEnumerable<IVisual> ITemplatedControl.VisualChildren
         {
             get 

Perspex/IVisual.cs

@@ -13,7 +13,9 @@ namespace Perspex
     public interface IVisual
     {
         Rect Bounds { get; }
-        
+
+        IEnumerable<IVisual> ExistingVisualChildren { get; }
+
         IEnumerable<IVisual> VisualChildren { get; }
 
         IVisual VisualParent { get; set; }

Perspex/Visual.cs

@@ -51,6 +51,11 @@ namespace Perspex
             }
         }
 
+        IEnumerable<IVisual> IVisual.ExistingVisualChildren
+        {
+            get { return Enumerable.Empty<Visual>(); }
+        }
+
         IEnumerable<ILogical> ILogical.LogicalChildren
         {
             get { return new ILogical[0]; }
@@ -92,7 +97,7 @@ namespace Perspex
 
         protected virtual void AttachedToVisualTree()
         {
-            foreach (Visual child in ((IVisual)this).VisualChildren.OfType<Visual>())
+            foreach (Visual child in ((IVisual)this).ExistingVisualChildren.OfType<Visual>())
             {
                 child.AttachedToVisualTree();
             }

TestApplication/Program.cs

@@ -19,7 +19,6 @@ namespace TestApplication
 {
     class TestLogger : ILogger
     {
-
         public LogLevel Level
         {
             get;
@@ -51,33 +50,34 @@ namespace TestApplication
 
             Window window = new Window
             {
-                Content = new TestBorder 
-                { 
-                    Styles = new Styles 
-                    { 
-                        new Style(new Selector().OfType<TestBorder>())
-                        {
-                            Setters = new[]
-                            {
-                                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xff0000ff)),
-                            }
-                        },
-                        new Style(new Selector().OfType<TestBorder>().Class(":mouseover"))
-                        {
-                            Setters = new[]
-                            {
-                                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xffff0000)),
-                            }
-                        },
-                    }
-                },
-
-                //Content = new Button
-                //{
-                //    Content = "Hello World",
-                //    HorizontalAlignment = HorizontalAlignment.Center,
-                //    VerticalAlignment = VerticalAlignment.Center,
+                //Content = new TestBorder 
+                //{ 
+                //    Margin = new Thickness(10),
+                //    Styles = new Styles 
+                //    { 
+                //        new Style(new Selector().OfType<TestBorder>())
+                //        {
+                //            Setters = new[]
+                //            {
+                //                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xff0000ff)),
+                //            }
+                //        },
+                //        new Style(new Selector().OfType<TestBorder>().Class(":mouseover"))
+                //        {
+                //            Setters = new[]
+                //            {
+                //                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xffff0000)),
+                //            }
+                //        },
+                //    }
                 //},
+
+                Content = new Button
+                {
+                    Content = "Hello World",
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    VerticalAlignment = VerticalAlignment.Center,
+                },
             };
 
             window.Show();